Years ago when I worked at the Salvation Army we used to have to tell that to customers. Once you walked through the backroom door, it was a free for all. I acquired a lot of records, stereo equipment (two Pioneer RT-909 reel to reel decks, turntables, receivers, etc) and did a lot of learning/experimenting when it came to high-end clothing. I can't say I feel bad at all about shopping from the back room; it was the only real perk to that job besides the great people I worked and the fact that I lived like 3 miles away so I could bike there if I really wanted to. Upper management sucked, pay sucked, dress code sucked (long black pants and a white or red shirt), heat in the store worked 40% of the time and no a/c at all in the summer.
This was a long time ago, though. I'm sure things have changed drastically.